Flexural capacity of continuous reinforced concrete beams strengthened or repaired by CFRP/GFRP sheets

The flexural strengthening of reinforced concrete (RC) beams by bonding external composite materials has proved to be an effective and convenient technique. Several works, focus on mechanical behaviour continuous beam with two spans strengthened materials, were reported in literature. This paper presents the capacity RC three or repaired carbon glass fibre polymer (CFRP GFRP) sheets. Experimental program consists eight CFRP GFRP sheets one reference. dimension is same for all a length 9 m section 15x25 (cm). tests monotonic loading carried out varying damaged level beams, material type thickness. Five failure modes observed. results show that ultimate bending moment can improved between 14.8 26.6% case 7.2 11.8% beam, which was pre-damaged under pre-loading 100% load, as beam. optimal thickness positive negative region obtained. variation strain analysed.